6.9 An order for 200 bell ringers is processed on work centers 10 and 20. The setup and run times are as follows. It is decided to overlap the lot on the two work centers and to split the lot into two lots of 75 and 125. Move time between operations is 30 minutes. Work center 20 cannot be set up until the first lot arrives. Calculate the saving in manufacturing lead time. Setup on A = 50 minutes Run time on A = 5 minutes per piece Setup on B = 100 minutes Run time on B = 7 minutes per piece